Fuse-plug.



S.T.S1OBERG.

FUSE PLUG.

APPLICANON HLED fm2. 19m,

Patented July 17, 19H.

JWN/:555.5

5y n i) UNITED s'rATns rarrinfr orricn SIDNEY T. SJOBERG, OF MINNEABOLIS, MINNESOTA FUSE-P13135.

Application filed February 2i, i916.

27o all whomc't may concern.'

-Be it kno'ivn that I, SIDNEY T. SJOBERG,

citizen of the United States. resident of Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in FusefPlugs, of which the following is aspecification.

My invention relates to multiple fuse plugs or to that type in which a plurality of fuse Wires Iare employed to avoid the necessity of removing the plug and inserting a new. one every time a fuse Wire is burned out. i

The object of my invention is to provide a Amultiple fuse plug of extremely simple construction and onevvhich can be manufactured and sold at a comparatively lovv price. Otlierobjects of the invention wil-l appear from the following detailed description.l

The linv ention consists generally/.in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying 'drawings forming.

A embodying my 'inventiom Fig. 2 is a longitudinal sectional vieiv, Fig. 3 is a transverse sectional'view taken on line of Fig. 2,

Fig 4 is a sectional View taken on line y-g/ of Fig. 2.

In the drawing, 2 represents one member of the plug, composed of insulating niaterial, preferably porcelain, and 3 the other member,l also preferably of porcelain. These members have acentral orifice 4 therethrough to receive a contact pin 5, the ineinbers revolving on the pin to shift the circuit from one fuse Wire to another. This pin has a head G at the inner end forming a contact surface and an insulating Washer 7 is provided between said head and the metal sleeve 8 to prevent any possibility of arcing at this point. This sleeve is exteriorly threaded f engaging the threads of the socket, as ull in fuse plugs of this type.

A tongue 9 of suitable material, preferably brass and forming a spring contact, is. mounted at one end on the sleeve 8 and projects up through a hole l0 in the anged upper end of the member 2 and into a recess 11 that is formed in the lower end of the pluv member 3,A the Wallsl of said recess depending and encircling the upper end of the tongue or spring contact. The mem?? Patented Juiy i7, i317.

Serial No. 79,488.

ber 3 is provided with a plurality-of holes or sockets 12 therein extcnding'through the same from end to end and there ina'vbe anyl desired number of these holes, according to the number of fuse wires to be used. i

13- represents the fuse ivires, each having a concave .cap 14 attached to one end thereof and yfitted into the inner end of a socket 12 adjacent to the recess 1l, the fuse Wires extending centrally through the sockets and having their opposite ends soldered at l5 to a head 16r formed on the opposite end of the pin 5 from the head 6. This head has progections 17 thereon, arranged to extend between the ribs 18 formed on the end of the porcelain member 3 and operating as stops to prevent the head and pin from turning in the block and breaking the connection with the fuse Wires. The fuse vvires are centered in the sockets 12 by suitable insulation l() which is litted into the ends of the sockets, as shown in Fig. 2. An insulated cap 20,

.preferably of metal, is fitted over the plug member 3 and a portion of its vvalls is threaded to engage the threads on the end of the insulating member. The plug member 3 has numerals thereon opposite the fuse Wires to enable the user of the plug to readily determine when all of the Wires have been burned out.

The contact spring 9 has an end surface 21 that is formed to fit the concave surface of the caps lat and make a rubbing contact therewith as one member of the plug is revolved upon the other, thereby readily shifting' the circuit from one fuse Wire to the other.

The device is of very inexpensive construction, is composed of but fevv parts, and the shifting from one fuse Wire to another can be easily and quickly performed.

I claim as my invention:

l. A multiple fuse plug comprising a contact pin having heads on the ends thereof, insulating members mounted ci'. said pin for relative rotation, a` shell contact carried by one of said members, a contact spring connected With said shell contact, the other member having a plurality of longitudinal sockets extending therethrough and encircling; said pin, insulating caps mounted inone end .of said sockets, conducting caps mounted in the opposite 'ends of said sockets,

.fuse Wires connected With said conducting caps and :extending through said. sockets and throughv saidinsulating caps and connected to one end of said pin, and said contact spring being positioned to successively engage said conducting caps When one member is revolved with respect to the other.

2. A multiple fuse plug comprising acontact pin having heads onl the -ends'thereof, insulating members mounted on said pin for .relative rotation, one of saidvmembers hav-` ing a'recess in the-end thereof opposing the other member and provided with a plurality of holes encircling said pin and communicat-4 lowerends vof said holes, a'series of contact caps mounted in the lower ends 'of said holes in position to engage. said contact spring upon relative rotation of said members, fuse Wires connected `With one .endors-said pin and also connected respectively With' said, caps through said. holes, the rotation of 011e member with respect to the other 4causing saidcontact spring to successively engage A multiple fuse plugcomprisinga-contact pin, linsulating members mounted Aon said pin forvrelative rotation,'9ne of said members having a lrecesslin the end thereof opposing the 4other. .memberl and-,'.provided with a series of holes leading from-one end into said recess, a'shell'contact carried by :said other member and-having afslottedmy hand this vopening therein and a contact spring mountedon said. shell Contact and projecting through said opening into 'said recess and extending to a point adjacent said holes, a

series vof-conta 'ct. capsA mounted in the lower ends of said-holes'andf positioned to vengage- .the said contact spring When one lof said members is revolved with respect 'to' the other member, lfuse wiresjarranged in said holes engaging "sul-faces. f l

l and connected at onev endl with said pin and' Y at their-other ends'vvithv said caps, and saidv4 .caps and spring havingconcave'and convex 4. A multiple fuse 'plug comprising an in- I sula'ting member, a contact pin Wliereon said member is 'centrally mounted, said pin hav-,' ing a head at its end that is seated agalnst said member', said memberf having ribs formed lthereon with recesses betweenv them and said head having lugs'prectng Into l said recess and heldbysaid ribs-against revolution with respect to said member, and

said member having aseries of f useiwires" mounted therein and attached7tov-sail lugs;

contact ca'ps connected with 'said fuse-"Wires,

a second insulating member, a'shell contact' carried thereby and vhaving al conductor for engaging With said contact caps when one insulating member is revolved with respect., lto'l'he other member.

In Witness Whereof,'I-have hereuntoset 15th day of February-191'6;- SIDNEYVT. SJOBERG., 

